{
  "bibcode": "2014GCN.15913....1P",
  "body": "B. Porterfield (PSU) and R. Starling (U Leicester)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 140301A\n95 s after the BAT trigger (Page et al., GCN Circ. 15896).\nNo optical afterglow consistent with the XRT position\n(Goad et al. GCN Circ. 15898)\nis detected in the initial UVOT exposures. \nNo counterpart consistent with the optical counterpart observed by \nNOT (Kruehler et al. GCN Circ. 15899) is detected.\nPreliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first\nfinding chart (FC) exposure and subsequent exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite_FC           108          258          292         >21.8\nu_FC               320          744          265         >20.7\nwhite              108          920          231         >21.1\nv                  650          843           38         >18.7\nv                 6583        22273          392         >20.2\nb                  749          769           19         >19.2\nb                27968        28212          240         >21.0\nu                  320          744          265         >20.7\nw1                 700          719           19         >17.9\nw1               11294        45552         1408         >21.1\nw2                 799          818           19         >17.8\nw2                6378        58531         1122         >21.4\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.03 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 15913,
  "createdOn": 1393907235000,
  "email": "siegel@swift.psu.edu",
  "subject": "GRB 140301A: Swift/UVOT Upper Limits",
  "submitter": "Mike Siegel at PSU/Swift MOC  <siegel@swift.psu.edu>",
  "eventId": "GRB 140301A"
}